Caliburn Micro navigation service, causing exception exceptions

Question

I am using the ViewModel First approach and I am having problems transitioning from one ViewModel to another.

For example, I have two folders: View and ViewModels, and I have two files in each Page1View.xaml, Page2View.xamlandPage1ViewModel.cs, Page2ViewModel.cs

In my application launch, I have this line below and it works fine.

DisplayRootViewFor<Page1ViewModel>();

Now when I click the button from the event Page1ViewModel, when I add the line below, I get an exception with a null reference.

_navigationService.NavitageToViewModel<Page2ViewModel>();

Am I missing something here? To provide more information, this is a UWP application, and the container I use WinRTContainer, and I registered both ViewModels.

Answer 1

ViewModel. , DisplayRootViewFor Frame NavigationService.

: https://github.com/Caliburn-Micro/Caliburn.Micro/issues/126

View-first , NavigationService, Frame:

container.RegisterNavigationService(rootFrame);